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A gametophyte is the haploid structure or phase of life of a sexually reproducing plant. Each cell of a gametophyte contains one complete set of chromosomes. The gametophyte can be the dominant part of the plant's life cycle as in mosses, or very reduced as in flowering plants (angiosperms), where the female form (ovule) is known as a megagametophyte and the male form (pollen) is called a microgametophyte.
See also : Sporophyte, Alternation of generations, Archegonium, Antheridium
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